Nothing
hatMat <- function(x, trace = FALSE,
pred.sm = function(x,y,...)
predict(smooth.spline(x,y, ...), x = x)$y,
...)
{
## Purpose: Return Hat matrix of a smoother -- very general (but slow)
## -------------------------------------------------------------------------
## Author: Martin Maechler, Date: 7 Mar 2001, 11:12
stopifnot(is.logical(trace), length(trace) == 1)
n <- NROW(x)
if(is.unsorted(x) && !missing(pred.sm))
warning("'x' is not sorted increasingly:\n ",
" this may be inefficient and lead to wrong results")
y <- pred.sm(x, numeric(n), ...)
if(!is.numeric(y) || length(y) !=n)
stop("`pred.sm' does not return a numeric length n vector")
H <- if(trace) 0 else matrix(as.numeric(NA), n,n)
for (i in 1:n) {
y <- numeric(n) ; y[i] <- 1 # y := e_i ; (e_i)_j = 1_[i=j]
y <- pred.sm(x, y, ...)
if(trace) H <- H + y[i] else H[,i] <- y
}
H
}
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